An overall analysis of factors influencing the safety system of metro runningtunnel was carried out; a Hierarchy structure Model is set up.
较全面分析了影响地铁区间隧道安全体系的各个因素，建立了层次结构模型。
2
In addition, the structural connection of underground and elevated section, and the retaining structure connection of underground runningtunnel and underground station are presented.
地下区间敞开段与高架区间的结构衔接、地下区间与地下车站的围护衔接。
3
Connection protocol: This protocol multiplexes the encrypted tunnel to numerous logical channels, running over the User Authentication protocol.